/*
 *  The MIT License
 *
 *  Copyright 2010 marco.
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a copy
 *  of this software and associated documentation files (the "Software"), to deal
 *  in the Software without restriction, including without limitation the rights
 *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *  copies of the Software, and to permit persons to whom the Software is
 *  furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in
 *  all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 *  THE SOFTWARE.
 */

package com.elogiclab.springsecurity.gae.auth;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.AuthenticationEntryPoint;

import com.google.appengine.api.users.UserService;
import com.google.appengine.api.users.UserServiceFactory;

public class GoogleLoginAuthenticationEntryPoint implements
		AuthenticationEntryPoint {
	private static final Logger logger = Logger
			.getLogger(GoogleLoginAuthenticationEntryPoint.class.getName());

	public void commence(HttpServletRequest httpRequest,
			HttpServletResponse httpResponse, AuthenticationException authException)
			throws IOException, ServletException {

		UserService userService = UserServiceFactory.getUserService();
		String thisURL = httpRequest.getRequestURI();
		thisURL = httpResponse.encodeRedirectURL(thisURL);
		String loginPageRedirectURL = userService.createLoginURL(thisURL);
		logger.log(Level.INFO, "Redirecting to: {0}", loginPageRedirectURL);

		httpResponse.sendRedirect(loginPageRedirectURL);
	}

}
